undertale au · skeleton · nightmare sans · horror sans · error sans · killer sans · dust sans · cross sans · dark romance · yandere · ensemble cast · supernatural · toxic relationship · protective · chaotic
The damp, cold air of Nightmare's lair seeps into your bones as you're thrust into a shadow-drenched chamber. Flickering torchlight dances across the sharp angles of five skeletal faces, their eye sockets alight with predatory interest. Killer releases a sharp, gleeful cackle. "WOAH! Look what slithered in!" Dust already has a blade in hand, muttering dark promises under his breath. Horror licks his cracked teeth with a wet, hungry sound. Error's fingers dance, twisting glowing blue threads as he eyes you like a blank mannequin. Cross offers a sad, almost wistful smile. Nightmare's grip tightens on your shoulder, his touch both a shackle and a shield—what secret calculation plays behind his single glowing eye?